David Sutter

Quantum information theorist at @IBMResearch

[David Sutter @quantum_sutter]

@yaoyunshi @marcotomamichel @giulia_qp I am not an expert on these applications, but as far as I know there we are interested in statements involving the trace-distance which is related to the fidelity (via Fuchs-van der Graaf) and hence Uhlmann's theorem is relevant. Not sure how other relative entropies could help

[David Sutter @quantum_sutter]

Uhlmann's theorem states that the fidelity of two states rho and sigma can be expressed in terms of their purifications (where the fidelity simplifies). In https://t.co/TjOiEnHAIW we (with @giulia_qp and Renato Renner) generalize Uhlmann's theorem to Rényi relative entropies.

[David Sutter @quantum_sutter]

on bluesky now as `quantum-sutter`

[David Sutter @quantum_sutter]

@marcotomamichel congratulations Marco

[David Sutter @quantum_sutter]

@_MonitSharma For cutting wires the situation is different. We have a provable separation between LO and LOCC (check out https://t.co/OjLZrLu6y3).

[David Sutter @quantum_sutter]

We finally understand how to (optimally) cut arbitrary two-qubit gates. Two interesting findings:
(1) cutting multiple gates jointly is always cheaper than cutting them individually
(2) classical communication does not help
---> check out https://t.co/ecvgnNAQkj

[David Sutter @quantum_sutter]

@_MonitSharma This work was 1.5 years before our recent paper https://t.co/ecvgnNAQkj. At that time we had (and still have some) protocols for cutting gates with LOCC that we don't know how to cut with LO. But we don't have a proof that it is not possible (with the same overhead) with LO.

[David Sutter @quantum_sutter]

Follow up work on the effective dimension (with M. Datres, GP. Leonardi, @AFigalli):
(i) stronger generalization bound
(ii) lower bound that can be computed efficiently (for Markovian models)
(iii) new simulation results
--> check out https://t.co/VecvWGkjgb

[Marco Tomamichel @marcotomamichel]

There is something mesmerising about seeing one's paper(s) completely plagiarised, theorem by theorem, without any reference, and posted on arXiv. Compare
https://t.co/MASJafZuTA
with our
https://t.co/L4vBjpUMB9

[David Sutter @quantum_sutter]

Which of the two cuts below (dotted red vs dashed blue) is better? And what are the optimal costs? --> check out https://t.co/OjLZrLu6y3

[David Sutter @quantum_sutter]

@RichardKueng @jenseisert @phfaist @sylvaingigan @sutter_tobias don't forget the famous Fawzi brothers (Omar, Hamza, and Allhussein)

[David Sutter @quantum_sutter]

IBM blogpost about our recent work on circuit knitting https://t.co/uWesD6KtUY

[David Sutter @quantum_sutter]

Does classical communication between (small) quantum computers help to run large computations? We show it does. Check out https://t.co/26KFrelE5x

[National Academy of Sciences @theNASciences]

In recognition of his contributions to mathematical physics, Jürg Fröhlich of @ETH_en is being inducted into the National Academy of Sciences. Watch the #NAS159 livestream: https://t.co/9em3zvd1gK

[David Sutter @quantum_sutter]

How does entropy accumulate? Check out our recent generalization of the EAT https://t.co/3gA68GAWJU [joint work with Tony, Omar, and Renato]

[David Sutter @quantum_sutter]

How hard is it to train a quantum support vector machine? --> check out https://t.co/fSFMhzoQXu (joint work with @GianGentinetta, Arne, and Stefan

[Amira Abbas @AmiraMorphism]

New arXiv paper out! Purely classical machine learning :) in collaboration with @quantum_sutter @AFigalli and Stefan Woerner. We define and motivate a measure of capacity for ML models: the local effective dimension. We show how this quantity bounds generalization error 1/3

[Jay Gambetta @jaygambetta]

Happy to finally get this paper published and looking forward to seeing more results that bring error mitigation and correction together. @quantum_sutter https://t.co/gO6SElUIR0

[Mischa Woods @WoodsMischa]

I'm at #iccmp2021 today to receive the 2019 AHP prize awarded jointly with my co-authors Ralph Silva and @postquantum for https://t.co/3dz5iGTFIz. I wish they could be there. Nice to see @quantum_sutter (AHP prize 2018) and J. Bauch (AHP prize 2017) in person again!

[David Sutter @quantum_sutter]

@hubersebi @ETH_physics good job with the bike. I tried to run there yesterday and was struggling even without a bike :-(